Cornflower blue is a trade description, not a species or a grade. It refers to a medium-toned, vivid blue with a gentle violetish cast — the soft, slightly velvety blue of the cornflower itself, neither as dark and inky as navy nor as pale as sky blue. This page gathers the stones in our collection whose colour sits within that range, drawn together by appearance rather than by mineral family.
Three varieties appear here. Blue Sapphire, corundum coloured by traces of iron and titanium, is the classic bearer of the term and offers the highest hardness of the group. Blue Zircon brings a different character: strong dispersion and a lively, almost electric brilliance, though it is softer and more prone to edge wear. Blue Star Sapphire shares the sapphire's chemistry but is cut en cabochon so that fine needle inclusions produce a six-rayed star, which softens and slightly lightens the body colour.
When choosing, weigh the setting and wear pattern against hardness, and consider whether you want faceted fire, quiet saturation or the moving light of asterism.
